pudquick

Reproducible Builds for macOS

There's a neat writeup I stumbled across recently titled "Reproducible codesigning on Apple Silicon" from Keith Smiley about some gotchas when it comes to compiling a binary in a way that's repeatable and always generates the exact same byte output (which would then checksum to the exact same hash) - even if compiled on a different Mac.

In applying the suggestions I found in the blog post, I found a few other corner cases that I just wanted to get documented more explicitly somewhere.

Tools Matter

Footnote 2 from that blog post is important:

insidegui

#!/bin/bash

# Recursivelly removes all apps from your Xcode archives from the LaunchServices database, preventing them from being used for widgets, launch at login, etc.

/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -R -f -u $HOME/Library/Developer/Xcode/Archives

dsabanin

defaults write com.apple.dt.Xcode ShowDVTDebugMenu -bool YES
sudo mkdir -p /Applications/Xcode.app/Contents/Developer/AppleInternal/Library/Xcode
sudo touch /Applications/Xcode.app/Contents/Developer/AppleInternal/Library/Xcode/AppleInternal.plist

# Don't forget to restart Xcode

steventroughtonsmith

//
//  UIView+Tooltips.h
//  Crossword
//
//  Created by Steven Troughton-Smith on 13/09/2019.
//  Copyright © 2019 Steven Troughton-Smith. All rights reserved.
//

#import <UIKit/UIKit.h>

bbl

Check if variable is defined in a Makefile

Using ifndef

ifndef MY_FLAG
$(error MY_FLAG is not set)
endif

steventroughtonsmith

#!/bin/bash

TARGET="$( cd "$(dirname "$1")" ; pwd -P )/$1"
SYSROOT="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk"
TARGET_ARCH=x86_64
export IPHONEOS_DEPLOYMENT_TARGET=12.2

rm -r /tmp/bitcode2intel
mkdir -p /tmp/bitcode2intel
pushd /tmp/bitcode2intel

michaeleisel

#import "fishhook.h" // from https://github.com/facebook/fishhook

// Replace write and writev, the two "chokepoint" functions that writes to stderr and stdout will probably pass through
static int (*originalWritev)(int fd, const struct iovec *v, int n);
static int (*originalWrite)(int fd, const void *buf, size_t size);

void checkForBadConstraintsMessage(int fd, const char *string, size_t size) {
    if (strnstr(string, "UIViewAlertForUnsatisfiableConstraints", size)) {
        // Write it to the console anyways before crashing
        originalWrite(fd, string, size);

DerekSelander

//
//  LLDB_command_search.mm
//  Code Challenge
//
//  Created by Derek Selander on 11/6/18.
//  Copyright © 2018 Selander. All rights reserved.
//

#import <UIKit/UIKit.h>
#import <objc/runtime.h>

a-voronov

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>DVTConsoleDebuggerInputTextColor</key>
	<string>1 1 1 1</string>
	<key>DVTConsoleDebuggerInputTextFont</key>
	<string>SFMono-Medium - 12.0</string>
	<key>DVTConsoleDebuggerOutputTextColor</key>
	<string>1 1 1 1</string>

DerekSelander

+ (void)load {

    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{

        int imageCount = _dyld_image_count();
        const struct mach_header* UIKitHeader = nil;
        for (int i = 0; i < imageCount; i++) {
            if (strcmp(basename((char *)_dyld_get_image_name(i)), "UIKit") == 0) {
                UIKitHeader = _dyld_get_image_header(i);